class SimulatorMain(wx.Frame):
...other Components...
menuBar = wx.MenuBar()
menuBar.Append(fileMenu, "&File")
menuBar.Append(helpMenu, "&Help")
self.SetSize(400, 400)
# Give the menu bar to the frame
self.SetMenuBar(menuBar)
I found I was quite wrong in my approach. I was not wanting to append sub menus but simply menuItems to the main menu section. Now the SetMenuBar works, or stopped not working…